1. Midgard Serpent
2. Imperiex
3. Ulterminus

Mogo....just wanted to add this before I read through this thread.

Marvel: (and #1 want period) Onslaught, would be cool sculpt if he was standing on his citidel.

DC: Colossal Mogo and/or Sinestro Corp living city thingy (can't remember name)

Giant: Bi-Beast

Sentinel-Size: MODOK with giant robot body

Colossal: Pitcher-Head Celestial

Giants:
Sentinels
The Gardener
The Stranger
Kree Sentry
Mole Man's Monster
Storm Giants

Collossals:
Ymir
Shogun Warriors
Hand of Five, Cerabrus and the elemental that fought the Shogun Warriors
Tri Sentinel

Collossal:
Onslaught

Giant:
Giant Girl (MA Janet van Dyne)
Generic Sentinel
Ymir

DC
Xeen Arrow
Octopus Man

Marvel
Modok in giant armor
It, the Living Colossus

I agree wholeheartedly!!! Not making him would be a lost opportunity!!! Also, the Anti-Monitor should be at least Galactus-sized!!! He destroys universes, not just planets!!!

The Great Big O!

You know that thing could make an awesome action pack!

Proteus
Onslaught
Beyonder

Ranx the Sentinent City.

If we could get a Mogo, why not an Ego as well.

I want

Apocalypse
Onslaught
Mephisto in his giant lizard form
all the monsters from Giantkiller
Big Guy
The Mole Man's monsters.

I knew I missed something.

It would not be right to get the Big O and not get the rest of the robots.

Giant Double Based Sentinel (with capture trait)